Answer: There are a number of potential causes for this, so figuring it out requires a process of elimination. Think back to the moment: Were you simply scared awake by nightmares? Another unpleasant but relatively harmless thing that can wake you up this way is anxiety—strong emotions related to stress can trigger a rapid heart rate. As for more physical causes, certain medications—like some asthma treatments—can make your heart race. (Ask your doc if changing or adjusting the medication is possible.) If you regularly skip meals, or if you are diabetic and take medication to control your blood sugar, sometimes your sugar can drop too low, making your heart pound.

Ruled out all those situations? There are also some heart conditions called arrhythmias that cause an irregular heart rate, as can an overactive thyroid. My advice: If this has happened several times and you don't recall having a bad dream and you're not particularly stressed out, see your doctor to check for and treat any physical issues—and get back to getting the rest you need.

This article originally appeared in the September 2017 issue of Women's Health. For more great advice, pick up a copy of the issue on newsstands now!

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